Delivering preheated air to combustion chambers



June 18, 1929. G. VAN DAAM DELIVERING PREHEATED AIR TO COMBUSTIONCHAMBERS 2 Sheets-Sheet l I Filed Dec. 21, 1927 .flziorney June 18,1929.G. VAN DAAM DELIVERING PREHEATED AIR TO COMBUSTION CHAMBERS 7 Filed D80.21, 1927 2 Sheets-Sheet 2 WM vliforneg M67220)": Ger-r12; Min/DeanaPatented June 18, 1929.

UNITED (STATES GERRI'I VAN DAAM, OF 'BUFFALO, 'NEW .YORK.

DELIVERING PREHEATED AIR TOCO MBUSTION CHAMBERS.

Application filed December 21, 1927. Serial No. 241,582

My invention relates to delivering preheated air-to combustion chambers,and is especially applicableto the combustion of coal, Where theunburned gasesrise from the fuel bed :and are mixed with the preheatedair delivered thereto to facilitate the combustion of said gases. i

:The invention also comprises the control of the flow of air to bepreheated and deliv ered to the combustion chamber in order to 'meet theconditions of the fuel bed and the temperature'of the combustion chamberso that when the combustion chamber is relatively'cold the flow of airwill be restricted and as the'chamber becomes heated the flow of airwill be relatively increased.

Referring to the drawings which illustrate merely 'by way of example,suitable means for effecting the invention Fig. 1 is a centrallongitudinal section of the air heating element.

Fig. 2 is a similar view showing a modification.

Fig. 3is a cross-section online 3, 3 of Fig. 1.

Fig. 4 is an elevation of the discharge end of the element.

Fig. 5 is an elevation of the inlet end of same.

Fig. 6 is an elevation of the air inlet damper and thermostat controltherefor.

Fig. 7 is a side elevation with adjacent parts in section of amodification of thermostat control.

Fig. 7 a is a section on the line 7 7 of Fig. 7.

Similar.numerals refer to similar parts throughout the several views.

The chambered formation is preferably made with double corrugated walls8 and 9 with struts or posts 10 cast integral therewith for holding thesame together in proper spaced relationship and for communicating heatto the space or passageway 11, between said walls.

The annular passageway 11 is in communication with the entrance chamber12 at one end and with the discharge chamber 13 at the other end of theheating element. The central chamber 14 is the tempering chamber and isalso in communication with the entrance chamber 12, but may be closed tochamber 13 by means of the plug 14 as in Fi 1.

The entrance chamber 12 is in communication with the inlet pipe orpassage 15 which passes through and is secured to the furnace door 16and is provided on the end projecting outside the furnace door with theair intake cap or head 19, which is shown threaded onto pipe 15 andforms a clamping means ed to move in the plane of the margin of theopening of passage 15.

In Fig. 7 the thermostat comprises the fiat bi-metallic strip 22 in coilformation secured to one end of therod 23'carrying at its other end thedamper or valve '24 adapted to move to and away from the opening ofinlet passage 15 at right angles'to the-plane ofsaid opening. W

I This thermostat controlled valve is located withinfthe entrancechamber 12and partakes of the temperature ofthe heating element, 1

In Fig. 2, screens 25 and 26 ofwire cloth,

or the like, are inserted transverse the longitudinal extension ofchamber 14. .In the zones of greater cross-sect on the screens 25 are ofannular formation: the central opening of same being closed by a metaldisc or baffle 27. In the zones of lesser cross-section the annularpieces or baflles 28 of sheet metal are inserted, with the openings insame closed by the screens 26. With this construction the chamber 14 isopen at both ends and forms a passage from chamber 12 to chamber 13.With this construction the chamber 14 ma form, the sole passage fromchamber 12 to chamber 13 or it may be effective in cooperation withpassage-way 11.

What I elaimis:-

1. In a device of the character described, the combination of an airheating element comprising a chambered formation having double paralleland continuous corrugated walls of annular cross-section forming acentral continuous chamber and a passage between said walls from one endto the other, with an air inlet at one end and a chamber provided withdischarge vents at the other end.

2. In a device of the character described, the combination of an airheating element comprising a chambered formation having double paralleland corrugated walls of annular cross-section forming a centralcontinuous passage with the inner wall and a passage between said twowalls from one end to' the other, with an air inlet at one end and achamber provided with discharge vents at the other end, and a thermostatcontrolled valve for the inlet comprising a bi-metal strip in curvedformation attached directly to the damper.

3. In a device of the character described, the combination of an airheating element comprising a chambered formation having double paralleland corrugated walls forming a passage'between said walls from one endto the other, with an air inlet at one end and a chamber provided withdischarge vents at the other end, and means for clamping the element toa supporting wall including a chambered air inlet head located outsidethe combustion chamber.

4. In a device of the character described, the combination of an airheating element comprising a chambered formation having double paralleland corrugated walls of annular cross-section with spacing strutsbetween said walls, forming a passage between said walls from one end tothe other, with an air inlet at one end and a chamber provided withdischarge vents at the other end.

5. In a heating device of the character described, the combination of anair heating element comprising a chambered formation having corrugatedwalls forming a passage from one end to the other, with an air inlet atone end and discharge vents at the other end, and annular screensinserted transverse the longitudinal extension of the passage in thezones of greater cross-section and sheet metal discs centrally disposedin the openings of said screens.

6. In a heating device of the character described, the combination of anair heating element comprising a chambered formation.

sert-ed transverse the longitudinal extension r of the passage in zonesof lesser dimension with screens of wire mesh inserted in the openingsof said annular formations.

7. In a device of the character described,

the combination of an air heating element comprising a chamberedformation providing a passage of annular cross-section, extending fromone end to the other of the heating element, with an air inlet at oneend and discharge vents at the other end, an inlet valve between theinlet and the said passage and a thermostat control for said passagecomprising a valve and single bent bi-metal strip having one end securedto a stationary support and the other end secured directly to andsupporting the valve. 7

8. In a device of the character described, the combination of an airheating element 'con'iprising a chambered formation provid ing a passageof annular cross-section and extending from one end of the heatingelement to the other with an air inlet at oneend and discharge vents atthe other end, an inlet valve between the inlet and the said passage anda thermostat control therefor comprising a single curved bi-metal striphaving one end secured to a stationary supportand the other endconnected directly to and forming the sole support for the valve.

GERRIT VAN DAAM.

